Method for producing glass sheet and glass sheet

ABSTRACT

An aspect of the present invention is directed to a method for producing a glass sheet with a coating, produced by applying a functional liquid for providing a function to the glass sheet, to at least one face of the glass sheet, including a first step of supplying the functional liquid to an ejection portion having a nozzle that ejects the functional liquid toward the glass sheet, and a second step of applying the functional liquid to the glass sheet while moving the glass sheet relative to the ejection portion in a fixed state such that the functional liquid ejected from the nozzle is applied to a predetermined region on the at least one face of the glass sheet, wherein a tube member that transports the functional liquid is connected to the ejection portion, and, in the first step, the functional liquid is supplied by the tube member to the ejection portion.

TECHNICAL FIELD

The present invention relates to a method for producing a glass sheet,and the glass sheet.

BACKGROUND ART

Conventionally, various methods have been proposed for applying acoating for UV protection or the like to automobile window glasses. Forexample, Patent Document 1 discloses the following method. First, anautomobile window glass is held in a standing state. Then, while anozzle for an application liquid is being moved relative to the windowglass, the application liquid is ejected from the nozzle so as to beapplied to the window glass. Flowing of the application liquid aroundfrom an application target face to an opposite face thereof issuppressed by fixing the position of the window glass in this mannerwhile moving the nozzle.

CITATION LIST Patent Literature

Patent Literature 1: JP 2011-256060A

SUMMARY OF INVENTION Technical Problem

Incidentally, a tube member such as a rubber hose is connected to thissort of nozzle, and the application liquid is sent via this tube memberto the nozzle. Thus, according to the method of Patent Literature 1,when the application liquid is ejected toward the window glass whilemoving the nozzle, the tube member moves in accordance with the nozzle,and thus vibration is transmitted to the nozzle, so that the applicationliquid may be applied to the window glass from the nozzle that isvibrating. Accordingly, an application line formed on the window glassby the applied application liquid becomes wave-like, resulting inproblems in which the appearance of the window glass becomes poor, theapplication liquid flows around from an application target face to anopposite face thereof, and the like.

An aspect of the present invention was made in view of thesecircumstances, and it is an object thereof to provide a technique forsuppressing undulation of an application liquid generated when applyingthe application liquid to a glass sheet.

Solution to Problem

In order to solve the above-described problems, the present inventionadopts the following configurations.

That is to say, a first aspect of the present invention is directed to amethod for producing a glass sheet with a coating, produced by applyinga functional liquid for providing a function to the glass sheet, to atleast one face of the glass sheet, including: a first step of supplyingthe functional liquid to an ejection portion having a nozzle that ejectsthe functional liquid toward the glass sheet; and a second step ofapplying the functional liquid to the glass sheet while moving the glasssheet relative to the ejection portion in a fixed state such that thefunctional liquid ejected from the nozzle is applied to a predeterminedregion on the at least one face of the glass sheet; wherein a tubemember that transports the functional liquid is connected to theejection portion, and in the first step, the functional liquid issupplied by the tube member to the ejection portion.

As a result of an in-depth study, the inventors of the present inventionfound that, when applying an application liquid to a glass sheet whilemoving a nozzle, a tube member whose weight has increased by the weightof the application liquid that is being transported thereby vibrates inaccordance with the movement of the nozzle, and this vibration of thetube member is transmitted to the nozzle to cause vibration of thenozzle. Thus, according to the first aspect of the present invention,the functional liquid is applied to the glass sheet while moving theglass sheet relative to the ejection portion to which the tube memberthat transports the functional liquid as the application liquid isconnected, in a state where the ejection portion is fixed without beingallowed to move. Thus, the vibration that is generated in the tubemember can be suppressed, and undulation of the application liquidgenerated when applying the application liquid to the glass sheet can besuppressed.

Furthermore, a second aspect of the present invention is directed to themethod for producing a glass sheet according to the first aspect,wherein the tube member is made of a soft material. If the tube memberthat transports the functional liquid is made of a soft material, thetube member is likely to vibrate in accordance with the movement of thenozzle. Accordingly, if the tube member that transports the functionalliquid is made of a soft material as in the second aspect of the presentinvention, it is expected that the above-described effect of suppressingundulation becomes large.

Furthermore, a third aspect of the present invention is directed to themethod for producing a glass sheet according to the first or secondaspect, wherein, in the second step, the functional liquid is applied tothe face of the glass sheet by causing the functional liquid ejectedonto the face of the glass sheet to flow downward. According to thethird aspect of the present invention, the functional liquid can besufficiently supplied also to a portion to which the functional liquidis not directly ejected, so that the amount of functional liquid used toapply the functional liquid to the glass sheet can be reduced.

Furthermore, a fourth aspect of the present invention is directed to themethod for producing a glass sheet according to the third aspect,further including: a third step of, after the functional liquid isejected onto the face of the glass sheet in the second step, blowing aironto the portion to which the functional liquid was ejected.

The thickness of the coating formed by causing the ejected functionalliquid to flow downward on the face of the glass sheet is thin at aportion where the functional liquid is ejected and starts to flowdownward, and gradually becomes thicker along the direction in which thefunctional liquid flows downward. That is to say, a difference betweenthe coating thickness on a portion to which the functional liquid isejected and the coating thickness on a portion that the functionalliquid that has flowed downward reaches is large.

Incidentally, since the functional effect realized by the functionalliquid depends on the coating thickness, the functional effect realizedby the functional liquid may not be ensured at a portion in which thecoating thickness is thin, that is, a portion to which the functionalliquid is ejected. As a method for solving this problem, there is amethod in which the amount of functional material added to thefunctional liquid in order to realize a function is increased such thatthe functional effect realized by the functional liquid can be ensuredalso in a portion in which the coating thickness is thin. However,according to this method, the proportion of functional materialcontained in the coating formed by the functional liquid increases.Accordingly, the mechanical strength of the coating may be lowered.

On the other hand, according to the fourth aspect of the presentinvention, after the functional liquid is ejected, air is blown onto theportion to which the functional liquid was ejected, and thus the portionto which the functional liquid was ejected is dried in a shorter time,and the coating thickness on the portion to which the functional liquidwas ejected can be increased. Thus, the difference between the coatingthickness on a portion to which the functional liquid is ejected and thecoating thickness on a portion that the functional liquid that hasflowed downward reaches can be suppressed. Accordingly, in the portionto which the functional liquid is applied, the functional effectrealized by the functional liquid can be ensured while suppressing theamount of functional material added. Since the amount of functionalmaterial added can be suppressed, the mechanical strength of the coatingcan be increased.

Furthermore, a fifth aspect of the present invention is directed to themethod for producing a glass sheet according to the third or fourthaspect, wherein, in the second step, the functional liquid is applied tothe glass sheet in a state of standing in a vertical direction.According to the fifth aspect of the present invention, the glass sheetstands in the vertical direction, so that the functional liquid flowsdownward easily, and the time necessary to apply the functional liquidcan be shortened. Note that the state in which the glass sheet stands inthe vertical direction may refer to a state in which the angle formed bythe glass sheet and the vertical direction is 0 degrees, as well as astate in which the glass sheet is slightly inclined with respect to thevertical direction. For example, the state in which the glass sheetstands in the vertical direction may refer to a state in which the angleformed by the glass sheet and the vertical direction is suppressed to 30degrees or less, in order to prevent the functional liquid coating frombeing too thick.

Furthermore, a sixth aspect of the present invention is directed to themethod for producing a glass sheet according to the third or fourthaspect, wherein, in the second step, the functional liquid is applied tothe face of the glass sheet in a state where an upper side of the glasssheet is oriented downward in a vertical direction and the glass sheetis inclined toward the nozzle with respect to the vertical direction.With this configuration, the functional liquid can be applied not to theentire end face at the upper side of the glass sheet but to part of theend face. Accordingly, the functional liquid is not applied to the otherpart of the end face at the upper side of the glass sheet, and thus theend face can be prevented from being slippery when it is held during theprocessing. Furthermore, with this configuration, since the functionalliquid is applied to the glass sheet that is inclined toward the nozzlewith respect to the vertical direction, the functional liquid can beprevented from flowing around from an application target face to anopposite face thereof.

Furthermore, a seventh aspect of the present invention is directed tothe method for producing a glass sheet according to any one of the firstto sixth aspects, wherein, in the second step, the functional liquid isapplied in an upper-lower direction of the glass sheet, by moving theglass sheet closer to or away from the nozzle in a direction in whichthe nozzle ejects the functional liquid. According to the seventh aspectof the present invention, the functional liquid can be applied in theupper-lower direction to the glass sheet, without moving the glass sheetin the upper-lower direction relative to the nozzle that ejects thefunctional liquid.

Furthermore, an eighth aspect of the present invention is directed tothe method for producing a glass sheet according to any one of the firstto seventh aspects, wherein an application start region from whichapplication of the functional liquid is started is defined on the faceof the glass sheet, and in the second step, after the glass sheet hasmoved to a position where the functional liquid ejected from the nozzlewill hit the application start region, ejection of the functional liquidfrom the nozzle is started. According to the eighth aspect of thepresent invention, ejection of the functional liquid from the nozzle isstarted after the glass sheet has moved to a position where thefunctional liquid hits the application start region, so that theejection of superfluous functional liquid that does not hit the glasssheet is suppressed.

Furthermore, a ninth aspect of the present invention is directed to themethod for producing a glass sheet according to any one of the first toeighth aspects, wherein, in the second step, an application line along aregion onto which the functional liquid was ejected is formed on theface of the glass sheet, and the application line is formed along atleast part of a peripheral edge of the glass sheet. According to theninth aspect of the present invention, the application line is formed onthe face of the glass sheet while suppressing undulation of theapplication liquid generated when applying the application liquid to theglass sheet. Thus, according to the ninth aspect of the presentinvention, the possibility that a wave-like application line is formedmaking the appearance of the glass sheet poor can be reduced.Furthermore, the application line can be formed along an applicationtarget line. That is to say, the level of precision for the position atwhich the application line is to be formed can be improved.

Furthermore, a tenth aspect of the present invention is directed to amethod for producing a glass sheet with a coating, produced by applyinga functional liquid for providing a function to the glass sheet, to atleast one face of the glass sheet, including: a first step of supplyingthe functional liquid to an ejection portion having a nozzle that ejectsthe functional liquid toward the glass sheet; a second step of applyingthe functional liquid to the at least one face of the glass sheet, byejecting the functional liquid onto the face of the glass sheet whilemoving the glass sheet relative to the ejection portion such that thefunctional liquid ejected from the nozzle is applied to a predeterminedregion on the face of the glass sheet, and causing the functional liquidejected onto the face of the glass sheet to flow downward; and a thirdstep of, after the functional liquid is ejected onto the face of theglass sheet in the second step, blowing air onto the portion to whichthe functional liquid was ejected.

Conventionally, the entire face of a glass sheet is dried afterapplication of the application liquid to the face of the glass sheet iscompleted. Accordingly, the application liquid flows downward from theportion to which the application liquid is ejected onto the face of theglass sheet, resulting in a problem in which the thickness of thecoating formed by the application liquid is thin at a portion where theapplication liquid is ejected and starts to flow downward, and graduallybecomes thicker along the direction in which the application liquidflows downward. That is to say, there is a problem in which a differencebetween the coating thickness on a portion to which the applicationliquid is ejected and the coating thickness on a portion that theapplication liquid that has flowed downward reaches is large.

Incidentally, since the functional effect realized by the functionalliquid depends on the coating thickness, the functional effect realizedby the functional liquid may not be ensured at a portion in which thecoating thickness is thin, that is, a portion to which the functionalliquid is ejected. As a method for solving this problem, there is amethod in which the amount of functional material added to thefunctional liquid in order to realize a function is increased such thatthe functional effect realized by the functional liquid can be ensuredalso in a portion in which the coating thickness is thin. However,according to this method, the proportion of functional materialcontained in the coating formed by the functional liquid increases.Accordingly, the mechanical strength of the coating may be lowered.

On the other hand, according to the tenth aspect of the presentinvention, after the functional liquid as the application liquid isejected, air is blown onto the portion to which the functional liquidwas ejected, and thus the portion to which the functional liquid wasejected is dried in a shorter time, and the coating thickness on thisportion can be increased. Thus, in the portion onto which the functionalliquid was applied, the functional effect realized by the functionalliquid can be ensured while suppressing the amount of functionalmaterial added. Since the amount of functional material added can besuppressed, the mechanical strength of the coating can be increased.

Furthermore, an eleventh aspect of the present invention is directed toa glass sheet, including: an application line formed in a step in whicha functional liquid for providing a function to the glass sheet isapplied to a face of the glass sheet, the application line being on theface of the glass sheet along a region to which the functional liquidwas ejected; and a coating formed by causing the functional liquidejected onto the application line to flow downward, wherein a differencein coating thickness in a range within 1 mm from the application line ina direction in which the functional liquid flows downward is 1.2 μm orless. According to the eleventh aspect of the present invention, thedifference in coating thickness near the application line is suppressedto 1.2 μm or less, and thus distortion due to the difference in coatingthickness is suppressed, and the appearance at the application line canbe improved.

Furthermore, a twelfth aspect of the present invention is directed to aglass sheet, including: an application line formed in a step in which afunctional liquid for providing a function to the glass sheet is appliedto a face of the glass sheet, the application line being on the face ofthe glass sheet along a region to which the functional liquid wasejected; and a coating formed by causing the functional liquid ejectedonto the application line to flow downward, wherein a local maximum thatappears in a coating thickness first from the application line in adirection in which the functional liquid flows downward is 3.2 μm orless.

The functional liquid coating is formed by causing the functional liquidto flow downward from the application line. Accordingly, the coatinghardly forms on the opposite side of the direction in which thefunctional liquid flows downward, and the coating appears from a regionnear the application line. Accordingly, if the local maximum thatappears in the coating thickness first in the direction in which thefunctional liquid flows downward from the application line is large, agap between a region without the coating and a region having this localmaximum increases. Thus, light that is transmitted through the glasssheet is likely to be refracted, and the appearance near the applicationline may be poor. On the other hand, according to the twelfth aspect,the local maximum that appears in the coating thickness first in thedirection in which the functional liquid flows downward from theapplication line can be suppressed to 3.2 μm or less, and thus theappearance near the application line can be prevented from being poor.

Furthermore, a thirteenth aspect of the present invention is directed toa glass sheet, including: an application line formed in a step in whicha functional liquid for providing a function to the glass sheet isapplied to a face of the glass sheet, the application line being on theface of the glass sheet along a region to which the functional liquidwas ejected; and a coating formed by causing the functional liquidejected onto the application line to flow downward, wherein a localmaximum that appears in a coating thickness first from the applicationline in a direction in which the functional liquid flows downward is 2.8μm or less. According to the thirteenth aspect, the local maximum thatappears in the coating thickness first in the direction in which thefunctional liquid flows downward from the application line can besuppressed more than in the twelfth aspect, so that the appearance nearthe application line can be further improved.

Furthermore, a fourteenth aspect of the present invention is directed toa glass sheet, including: an application line formed in a step in whicha functional liquid for providing a function to the glass sheet isapplied to a face of the glass sheet, the application line being on theface of the glass sheet along a region to which the functional liquidwas ejected; and a coating formed by causing the functional liquidejected onto the application line to flow downward, wherein the coatingin a vicinity of the application line within 1.2 mm therefrom in adirection in which the functional liquid flows downward is such that avariation in a coating thickness from a local maximum is suppressed to0.25 μm or less, the variation being generated in a range having asmaller variation amount in the coating thickness, of a range within 0.1mm downward from a position at the local maximum of the coatingthickness, in the direction in which the functional liquid flowsdownward, and a range within 0.1 mm upward from the position at thelocal maximum of the coating thickness, in the direction in which thefunctional liquid flows downward.

When forming a coating on a face of the glass sheet by causing thefunctional liquid to flow downward from the application line, thecoating thickness varies significantly near the application line. If thecoating thickness varies significantly, the surface of the coatingformed on the face of the glass sheet has a relatively sharpconcave-convex shape. Thus, light transmitted therethrough is likely tobe distorted, and the appearance near the application line may be poor.On the other hand, according to the fourteenth aspect, in the vicinityof the application line within 1.2 mm therefrom in the direction inwhich the functional liquid flows downward, the variation in the coatingthickness from a local maximum is suppressed to 0.25 μm or less, thevariation being generated in the range having a smaller variation amountin the coating thickness, of the range within 0.1 mm downward from theposition at the local maximum of the coating thickness, in the directionin which the functional liquid flows downward, and the range within 0.1mm upward from the position at the local maximum of the coatingthickness, in the direction in which the functional liquid flowsdownward. Accordingly, the possibility of this sort of distortionoccurring is reduced, and the appearance near the application line canbe prevented from being poor.

Furthermore, a fifteenth aspect of the present invention is directed toa glass sheet, including: an application line formed in a step in whicha functional liquid for providing a function to the glass sheet isapplied to a face of the glass sheet, the application line being on theface of the glass sheet along a region to which the functional liquidwas ejected; and a coating formed by causing the functional liquidejected onto the application line to flow downward, wherein the coatingin a vicinity of the application line within 1.2 mm therefrom in adirection in which the functional liquid flows downward is such thatdifferences between local maximums that appear in a coating thicknesssecond and thereafter from the application line in the direction inwhich the functional liquid flows downward, and local minimums adjacentto the local maximums that appear in the coating thickness second andthereafter are 0.3 jam or less, except for a local maximum that appearsin the coating thickness first from the application line in thedirection in which the functional liquid flows downward.

As described above, when forming a coating on a face of the glass sheetby causing the functional liquid to flow downward from the applicationline, the coating thickness varies significantly near the applicationline, and thus light transmitted therethrough is likely to be distorted,and the appearance near the application line may be poor. In particular,if the differences between the local maximums that appear in the coatingthickness second and thereafter in the direction in which the functionalliquid flows downward from the application line and the local minimumsadjacent to the local maximums that appear in the coating thicknesssecond and thereafter are large, distortion occurs over a wide range inthe direction in which the functional liquid flows from the applicationline, and the appearance near the application line may be poor.

On the other hand, with this configuration, in the vicinity of theapplication line within 1.2 mm therefrom in the direction in which thefunctional liquid flows downward, the differences between the localmaximums that appear in the coating thickness second and thereafter inthe direction in which the functional liquid flows downward from theapplication line and the local minimums adjacent to the local maximumsthat appear in the coating thickness second and thereafter aresuppressed to 0.3 μm or less. Accordingly, the possibility of this sortof distortion occurring is reduced, and the appearance near theapplication line can be prevented from being poor.

Furthermore, a sixteenth aspect of the present invention is directed toa glass sheet to which a functional liquid for providing a predeterminedfunction has been applied, including: an application line formed on aface of the glass sheet along a region to which the functional liquidwas ejected; and a coating formed from the application line to part ofan end face at an upper side of the glass sheet. With thisconfiguration, the functional liquid is applied not to the entire endface at the upper side of the glass sheet but to part of the end face.Accordingly, the functional liquid is not applied to the other part ofthe end face at the upper side of the glass sheet, and thus the end facecan be prevented from being slippery when it is held during theprocessing.

Advantageous Effects of Invention

According to the present invention, it is possible to suppressundulation of an application liquid generated when applying theapplication liquid to a glass sheet.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1A is a front view showing an example of a glass sheet according toan embodiment;

FIG. 1B is a side view showing an example of the glass sheet accordingto the embodiment;

FIG. 2 shows an example of an application system according to theembodiment;

FIG. 3 shows an example of application steps according to theembodiment;

FIG. 4 shows an example of a movement direction of the glass sheet whenapplying the functional liquid to a first side of the glass sheetaccording to the embodiment;

FIG. 5A shows an example of a movement direction of the glass sheet whenapplying the functional liquid to an upper side of the glass sheetaccording to the embodiment;

FIG. 5B shows an example of a positional relationship between afunctional liquid ejection region and an air-blown region according tothe embodiment;

FIG. 6 shows an example of a movement direction of the glass sheet whenapplying the functional liquid to a second side of the glass sheetaccording to the embodiment;

FIG. 7 shows an example of an installation position of an air blowingunit according to another embodiment;

FIG. 8 shows an example of an installation position of the air blowingunit according to another embodiment;

FIG. 9 shows an example of ejection portions according to anotherembodiment;

FIG. 10 shows an example of a functional liquid application stepaccording to another embodiment;

FIG. 11 shows an example of a state of the upper side of the glass sheetafter the application step according to the embodiment;

FIG. 12 is a graph showing the coating thickness near an applicationline when the functional liquid was applied while air was being blownfrom above onto the glass sheet;

FIG. 13 is a graph showing the coating thicknesses near the applicationline when air was blown after the functional liquid was ejected; and

FIG. 14 is a graph showing the coating thicknesses near the applicationline when air was blown after the functional liquid was ejected.

DESCRIPTION OF EMBODIMENTS

Hereinafter, an embodiment according to an aspect of the presentinvention (hereinafter, also referred to as the “embodiment”) will bedescribed with reference to the drawings. Note that the embodimentdescribed below is in all aspects merely an example of the presentinvention. It will be appreciated that various improvements andmodifications can be made without departing from the scope of thepresent invention. That is to say, specific configurations may beadopted as appropriate depending on the mode of implementation of thepresent invention.

§1 Configuration Example Glass Sheet

First, a glass sheet 10 used in this embodiment will be described withreference to FIGS. 1A and 1B. FIG. 1A is a front view showing an exampleof the glass sheet 10 according to this embodiment. FIG. 1B is a sideview showing an example of the glass sheet 10 according to thisembodiment. Note that, for the sake of ease of description, theupper-lower direction in FIGS. 1A and 1B is referred to as“upper-lower”, the right direction in FIG. 1A and the frontward side ofthe sheet of FIG. 1B are referred to as “right”, the left direction inFIG. 1A and the inner side of the sheet of FIG. 1B are referred to as“left”, the frontward side of the sheet of FIG. 1A and the leftdirection in FIG. 1B are referred to as “front”, and the inner side ofthe sheet of FIG. 1A and the right direction in FIG. 1B are referred toas “rear”.

The glass sheet 10 according to this embodiment is a glass sheet thatcan be used as a window glass attached to a window of a front or reardoor of an automobile, and is formed in a shape according to the door towhich the glass is to be attached. As shown in the example in FIG. 1A,the glass sheet 10 has a first side 11 as a right side extending in theupper-lower direction, and further has a second side 13 that is shorterthan the first side 11 as a left side opposite to the first side 11.

Furthermore, an upper side 12 in the shape of a slightly curved line isformed between the upper end of the first side 11 and the upper end ofthe second side 13. The angle formed by the first side 11 and the upperside 12 is smaller than 90 degrees, and the angle formed by the secondside 13 and the upper side 12 is larger than 90 degrees. The glass sheet10 is attached to a door of an automobile such that the upper side 12 ispositioned on the upper side. Accordingly, in a state where the doorwindow is closed by the glass sheet 10, a predetermined region extendingdownward from the upper side 12 is a region that is accommodated in aglass run attached to the upper portion of the door window.

Furthermore, a lower side 14 in the shape of a line bent at a pluralityof points is formed between the lower end of the first side 11 and thelower end of the second side 13. The lower side 14 has portionsprojecting downward respectively near the first side 11 and near thesecond side 13. In this embodiment, in a state where the glass sheet 10is attached to the door window, the lower side 14 of the glass sheet 10is attached to a window regulator. Accordingly, a predetermined regionextending upward from the lower side 14 is a region that is accommodatedin the door even in a state where the door window is closed by the glasssheet 10.

Furthermore, as shown in the example in FIGS. 1A and 1B, the glass sheet10 has a first face 15 that is inside the automobile and a second face16 that is outside the automobile, and has a shape curved rearward suchthat the first face 15 is concave and the second face 16 is convex. Theglass sheet 10 as described above is made of, for example, normal greenglass, UV-protection normal green glass, clear glass, heat-absorbingglass, or the like.

Application System

Next, an application system 1 for applying a functional liquid to theglass sheet 10 will be described with reference to FIG. 2. FIG. 2 showsan example of the application system 1 according to this embodiment.

The application system 1 according to this embodiment is a system forproducing a glass sheet with a coating by applying a functional liquidto the first face 15 of the glass sheet 10. As shown in the example inFIG. 2, the application system 1 includes an ejection portion 2 thatejects a functional liquid, a robot arm 4 that holds and moves the glasssheet 10, and an air blowing unit 5 that blows air onto the glass sheet10.

The functional liquid is a liquid to which a functional material forproviding a function to the glass sheet 10 has been added. For example,the functional liquid is preferably an ultraviolet-protection coatingliquid for providing an ultraviolet-protection function to the glasssheet 10, and other examples of the functional liquid may include aninfrared (IR)-protection coating liquid, an antifog coating liquid, awater-repelling coating liquid, an antifouling coating liquid, alow-reflective coating liquid, an electromagnetic-shielding coatingliquid, a coloring coating liquid, and the like.

The ejection portion 2 has a nozzle 22 that is oriented toward the glasssheet 10, a base portion 21 that supports the nozzle 22, and aconnection portion 23 that introduces the functional liquid into thebase portion 21. A tube member 6 that supplies the functional liquid isconnected to the connection portion 23. The functional liquid from apump (not shown) or the like that sends out the functional liquid issupplied by the tube member 6 to the ejection portion 2. The nozzle 22and the connection portion 23 are interconnected to each other via thebase portion 21, and the functional liquid supplied by the tube member 6is sent via the connection portion 23 and ejected from the nozzle 22.

Note that the tube member 6 is made of, for example, a soft materialsuch as vinyl chloride, fluoropolymer resin, rubber, or the like. Inthis case, for example, when the inside of the tube member 6 becomesdirty, the tube member 6 can be easily replaced. Furthermore, the costof the tube member 6 can be suppressed, and the degree of freedom inarranging the tube member 6 can be increased. However, the material forthe tube member 6 is not limited to soft materials, and, for example,hard materials such as metal, resin, or the like, also may be used.

As shown in the example in FIG. 2, the ejection portion 2 is fixed by afixing member 3. The fixing member 3 is configured by, for example, tworectangular plate members, that is, a first plate member 32 and a secondplate member 33, and is in the shape of an inverted L. The first platemember 32 is a vertically extending support column, and its upper end isconnected to one end of the second plate member 33 that extends in thehorizontal direction. The ejection portion 2 is attached at a point neara front end of the second plate member 33.

A catch portion 31 is provided near an intersecting point of the firstplate member 32 and the second plate member 33. The tube member 6 can becaught on the catch portion 31. Accordingly, the weight of tube member 6can be partially supported by the first plate member 32 as a supportcolumn of the fixing member 3, so that vibration of the tube member 6during transportation of the functional liquid can be reduced.

A front end of the robot arm 4 has a suction cup 41 that can suck theglass sheet 10. The robot arm 4 uses the suction cup 41 to hold theglass sheet 10, and can move the glass sheet 10 relative to the ejectionportion 2 that is in a fixed state. Accordingly, the functional liquidejected from the nozzle 22 is applied to a predetermined region on thefirst face 15 of the glass sheet 10.

The air blowing unit 5 is, for example, a unit for blowing air onto aportion to which the functional liquid was ejected, the unit beingconfigured by one or a plurality of fans. As shown in the example inFIG. 2 and FIG. 5A (described later), in this embodiment, the airblowing unit 5 is arranged on a side portion of the base portion 21 ofthe ejection portion 2 (on a side face of the base portion 21, on thefrontward side of the sheet of FIG. 2). Accordingly, after thefunctional liquid is ejected from the nozzle 22 to the first face 15 ofthe glass sheet 10, the air blowing unit 5 according to this embodimentcan blow air from the front of the glass sheet 10 onto a portion towhich the functional liquid was ejected.

Note that these constituent elements are controlled, for example, by acontroller (not shown). The controller includes, for example, one or aplurality of processors and peripheral circuits (a ROM (read onlymemory), a RAM (random access memory), an interface circuit, etc.) usedfor processing of the processors, and operates according to a programstored in the peripheral circuits such as the ROM. The thus configuredapplication system 1 is used to apply the functional liquid to the firstface 15 of the glass sheet 10.

§2 Operation Example

Next, an operation that applies the functional liquid to the glass sheet10 using the application system 1 will be described with reference toFIGS. 3 to 6. FIG. 3 shows an example of functional liquid applicationsteps of the application system 1 according to this embodiment. FIG. 4shows an example of a movement direction of the glass sheet 10 whenapplying the functional liquid along the first side 11 to the first face15 of the glass sheet 10. FIG. 5A is a view of the glass sheet 10 fromabove, showing an example of a movement direction of the glass sheet 10when applying the functional liquid along the upper side 12 to the firstface 15 of the glass sheet 10. FIG. 5B shows an example of a positionalrelationship between a region to which the functional liquid is ejectedwhen applying the functional liquid along the upper side 12(hereinafter, referred to as an “ejection region”) R and a region ontowhich air is blown by the air blowing unit 5 (hereinafter, referred toas an “air-blown region”) T. FIG. 6 shows an example of a movementdirection of the glass sheet 10 when applying the functional liquidalong the second side 13 to the first face 15 of the glass sheet 10.

It is assumed that the glass sheet 10 to which the functional liquid isto be applied is placed, for example, in a standing state. In thisembodiment, it is assumed that an application start region Ra from whichapplication of the functional liquid is started is defined on the firstface 15 of the glass sheet 10. In this case, before applying thefunctional liquid to the glass sheet 10, the application system 1 holdsthe placed glass sheet 10, using the suction cup 41 of the robot arm 4.Using the portion sucked by the suction cup 41 of the robot arm 4 as areference, in this embodiment, the robot arm 4 holds the glass sheet 10such that the second face 16 of the glass sheet 10 is inclined at anangle D with respect to the vertical direction. When an angle of arotation to the right is taken as a positive angle and an angle of arotation to the left is taken as a negative as shown in FIG. 4, in thisembodiment, the range of the angle D at which the robot arm 4 holds theglass sheet 10 is, for example, −30 degrees to +30 degrees. That is tosay, the robot arm 4 according to this embodiment holds the glass sheet10 such that the angle formed by the second face 16 of the glass sheet10 and the vertical direction is 30 degrees or less. The state in whichthe glass sheet 10 is held in this manner corresponds to the “state ofstanding in the vertical direction” of the glass sheet of the presentinvention. The state in which the glass sheet stands in the verticaldirection in this manner may refer to a state in which the angle formedby the glass sheet and the vertical direction is 0 degrees, as well as astate in which the glass sheet is slightly inclined with respect to thevertical direction.

Next, the application system 1 controls the robot arm 4 to move theglass sheet 10 to a position where the functional liquid hits (isejected at) the application start region Ra when ejecting the functionalliquid from the nozzle 22 of the ejection portion 2. After moving theglass sheet 10 to a position where the functional liquid is ejected ontothe application start region Ra, the application system 1 ejects thefunctional liquid in order of steps S101 to S103, which will bedescribed below. Accordingly, in this embodiment, the ejection ofsuperfluous functional liquid that does not hit the glass sheet 10 issuppressed, so that the functional liquid can be effectively applied tothe glass sheet 10. When the application of the functional liquid isstarted, the air blowing by the air blowing unit 5 onto the glass sheet10 is started as well.

In step S101, as shown in the example in FIGS. 3 and 4, the applicationsystem 1 applies the functional liquid along the first side 11 to thefirst face 15 of the glass sheet 10. Specifically, after ejecting thefunctional liquid from the nozzle 22 onto the application start regionRa, the robot arm 4 is controlled to move the glass sheet 10 downward(along the arrow U in FIG. 4). Note that the arrow A in FIG. 4 indicatesthe trajectory of the functional liquid ejected from the nozzle 22.

With this configuration, the application position of the functionalliquid ejected from the nozzle 22 moves upward on the first face 15 inaccordance with the movement of the glass sheet 10. That is to say, theapplication system 1 can apply the functional liquid along the firstside 11 to the first face 15 of the glass sheet 10, by moving the glasssheet 10 downward in this manner. When the application position reachesa region Rb, the application system 1 advances the procedure to thesubsequent step S102.

In the subsequent step S102, as shown in the example in FIGS. 3 and 5A,the application system 1 applies the functional liquid along the upperside 12 to the first face 15 of the glass sheet 10 while forming anapplication line L. Specifically, the application system 1 controls therobot arm 4 to move the glass sheet 10 rightward (along the arrow V inFIG. 5A), while maintaining the state of step S101 in which thefunctional liquid supplied via the tube member 6 is ejected from thenozzle 22. Then, when the application position of the functional liquidproceeds from the region Rb and reaches a region Rc, the applicationsystem 1 advances the procedure to the subsequent step S103.

In step S102, the functional liquid is applied while leaving some spacefrom the upper side 12 according to the region that is in contact withthe glass run when the glass sheet 10 is attached to a door window of anautomobile. Accordingly, the application line L is formed on the firstface 15 along the region to which the functional liquid is ejected. Theapplication line L indicates a boundary between the region to which thefunctional liquid was applied and the region to which the functionalliquid was not applied.

Furthermore, in step S102, the functional liquid ejected to the vicinityof the application line L flows downward, and thus the functional liquidis applied to the portion below the application line L on the first face15. That is to say, in this embodiment, the functional liquid is appliedto the portion below the application line L, using a so-calledflow-coating method. Accordingly, in step S102, the functional liquidcan be sufficiently supplied also to a portion to which the functionalliquid is not directly ejected, and the amount of functional liquid usedto apply the functional liquid to the glass sheet 10 can be reduced.

Furthermore, as shown in the example in FIG. 5B, the air blowing unit 5is arranged on a side portion of the ejection portion 2, and thus theair-blown region T of the air blowing unit 5 is adjacent to thefunctional liquid ejection region R. In step S102, as shown in theexample in FIGS. 5A and 5B, the robot arm 4 moves the glass sheet 10 inthe direction indicated by the arrow V, and thus, immediately after thefunctional liquid is ejected, the air blown from the air blowing unit 5hits the portion to which the functional liquid was ejected. As shown inthe example in FIGS. 2 and 5A, the air blowing unit 5 is arranged on aside portion of the nozzle 22. Accordingly, the air blowing unit 5 canblow air along the application line L onto the front face (on the firstface 15 side) of the glass sheet 10 regardless of the inclination of theglass sheet 10.

In the subsequent step S103, as shown in the example in FIGS. 3 and 6,the application system 1 applies the functional liquid along the secondside 13 to the first face 15 of the glass sheet 10. Specifically, theapplication system 1 controls the robot arm 4 to move the glass sheet 10away (in the direction indicated by the arrow W in FIG. 6) from thenozzle 22 along the direction in which the nozzle 22 ejects thefunctional liquid, while maintaining the state of step S102 in which thefunctional liquid is ejected from the nozzle 22.

With this configuration, the distance between the nozzle 22 and theglass sheet 10 becomes longer, and thus, as indicated by the trajectory(arrow A) of the functional liquid in FIG. 6, the application positionwhere the functional liquid hits moves downward on the first face 15.That is to say, the application system 1 can cause the position to whichthe functional liquid is to be ejected to be moved downward on the firstface of the glass sheet 10, without moving the glass sheet 10 upward.

The following effects can be obtained by applying the functional liquidalong the second side 13 in this manner. For example, if the glass sheet10 is moved away from the nozzle 22, the air-blown region by the airblowing unit 5 can be made larger. Accordingly, a relatively smallblower may be used as the air blowing unit 5 according to thisembodiment. Furthermore, for example, since the distance between thenozzle 22 and the glass sheet 10 becomes longer, the force of thefunctional liquid immediately before hitting the first face 15 of theglass sheet 10 becomes smaller. Accordingly, flowing of the functionalliquid around to the second face 16 can be suppressed.

When the application position of the functional liquid proceeds from theregion Rc and reaches a region Rd, the application of the functionalliquid to the glass sheet 10 in this embodiment is ended, and theapplication system 1 stops the ejection of the functional liquid fromthe ejection portion 2. Then, the application system 1 controls therobot arm 4 to place the glass sheet 10 at a predetermined location, andends the procedure according to this operation example. Subsequently,the application system 1 may repeat the operation and apply thefunctional liquid to a following glass sheet 10.

Note that, in steps S101 to S103, a step of supplying the functionalliquid that is to be ejected, via the tube member 6 to the ejectionportion 2, corresponds to a “first step” of the present invention.Furthermore, in steps S101 to S103, a step of ejecting the functionalliquid from the ejection portion 2, thereby applying the functionalliquid to the first face 15 corresponds to a “second step” of thepresent invention. Furthermore, in step S102, a step of moving the glasssheet 10, and causing the air blowing unit 5 to blow air onto a positionto which the functional liquid was applied corresponds to a “third step”of the present invention.

Furthermore, in steps S101 to S103 above, the functional liquid isapplied to a region of the first face 15, excluding the region betweenthe upper side 12 and the application line L. Accordingly, the region towhich the functional liquid is applied corresponds to a “predeterminedregion” to which the functional liquid is applied in the second step ofthe present invention.

The embodiment for producing the glass sheet 10 coated with thefunctional liquid as described above has the following features. First,when applying the functional liquid to the glass sheet 10 while movingthe ejection portion 2 as in conventional examples, the tube member 6whose weight has increased by the weight of functional liquid that isbeing transported thereby vibrates in accordance with the movement ofthe ejection portion 2. This vibration of the tube member 6 istransmitted to the ejection portion 2, and thus the functional liquid isejected in a wave-like state in accordance with the vibration of theejection portion 2, from the nozzle 22 toward the glass sheet 10.

Accordingly, when applying the functional liquid along the first side 11as in step S101, a problem may occur in which the application liquidflows around to the second face 16. In particular, in this embodiment,the tube member 6 is made of a soft material and easily vibrates, andthus this sort of problem is likely to occur.

Thus, in this embodiment, the ejection portion 2 is fixed without beingallowed to move. Therefore, the vibration that is generated in the tubemember 6 is suppressed, and undulation of the functional liquidgenerated when applying the application liquid is suppressed.Accordingly, in step S101, even when the application system 1 appliesthe functional liquid along the first side 11, flowing of the functionalliquid around to the second face 16 can be suppressed. With theapplication system 1 according to this embodiment, also in steps S102and S103, undulation of the functional liquid generated when applyingthe application liquid is suppressed.

Furthermore, according to this embodiment, immediately after thefunctional liquid is ejected, air is blown onto the portion to which thefunctional liquid was ejected, in accordance with the movement of theglass sheet 10. Accordingly, the coating near the application line L isdried by the blown air, and the coating thickness can be increased. As aresult, a difference between the coating thickness near the applicationline L and that near the lower side 14 can be suppressed.

§3 Modified Example

Above, an embodiment of the present invention was described in detail,but the description above is in all aspects merely an example of thepresent invention. It will be appreciated that various improvements andmodifications can be made without departing from the scope of thepresent invention.

Glass Sheet

For example, regarding the above-described specific configuration of theglass sheet 10, constituent elements thereof may be omitted, changed,replaced, or added as appropriate depending on the mode ofimplementation. For example, although the glass sheet 10 described abovehas a shape curved frontward, it may be flat. Furthermore, although theglass sheet 10 described above is used as a window glass attached to awindow of a front or rear door of an automobile, it may be a glass sheetthat can be used as a window glass of another vehicle, or may be a glasssheet that can be used in settings other than for vehicles.

Application System

Furthermore, for example, regarding the above-described specificconfiguration of the application system 1, constituent elements thereofmay be omitted, changed, replaced, or added as appropriate depending onthe mode of implementation. For example, if air blowing onto the glasssheet 10 is not performed, the air blowing unit 5 may be omitted.Furthermore, as a means for holding and moving the glass sheet 10, ameans other than the robot arm 4 may be used instead of the robot arm 4.

Furthermore, the ejection portion 2, the robot arm 4, and the airblowing unit 5 may be controlled by one controller, or at least one ofthese constituent elements may be controlled by another controller. Theair blowing unit 5 may be, for example, a mere fan not having acontroller. Furthermore, the ejection portion 2, the robot arm 4, andthe air blowing unit 5 may form a system integrated by one controller,or at least one of these constituent elements may be separate.

Furthermore, in the application system 1 described above, the ejectionportion 2 is fixed by the fixing member 3 in the shape of an inverted L.However, the configuration and the shape of the fixing member 3 do nothave to be limited to those described above, and other configurationsand shapes also may be adopted as long as the ejection portion 2 and thetube member 6 are fixed. The method for fixing the ejection portion 2may be selected as appropriate depending on the mode of implementation.

Furthermore, in the application system 1 described above, the airblowing unit 5 is installed on a side portion of the ejection portion 2.The installation position of the air blowing unit 5 is not limited tothat in the example, and may be set as appropriate depending on the modeof implementation.

For example, FIGS. 7 and 8 show examples of the installation position ofthe air blowing unit 5 according to other embodiments. In FIG. 7, theair blowing unit 5 is installed on an upper portion of the ejectionportion 2. In FIG. 8, the air blowing unit 5 is installed at a positionapart from the ejection portion 2. As shown in the example in FIG. 8,the air blowing unit 5 may be installed at a location other than theejection portion 2 such that, immediately after the functional liquid isejected, air can be blown onto the portion to which the functionalliquid was ejected.

Note that, in the foregoing embodiment and FIGS. 7 and 8, the airblowing unit 5 is arranged such that, immediately after the ejectionportion 2 applies the functional liquid, air can be blown onto theportion to which the functional liquid was applied. However, it issufficient that the air blowing unit 5 is arranged such that coatingthickness can be increased. For example, the air blowing unit 5 may beinstalled at a position where, after the functional liquid is ejectedonto the first face 15 of the glass sheet 10, air can be blown onto theportion excluding the region that will be naturally dried, on the firstface 15 of the glass sheet 10 to which the functional liquid wasejected, at least before the functional liquid completely flowsdownward.

Furthermore, as shown in the example in FIG. 5B, the air blowing unit 5described above blows air onto the region adjacent to the functionalliquid ejection region R. However, the range onto which the air blowingunit 5 can blow air (the air-blown region T) does not have to be limitedto this range, and, for example, may include the functional liquidejection region R. Furthermore, if a glass sheet is moved at 45 mm/s,the air-blown region T may be apart from the ejection region R, forexample, by approximately 200 mm. As described above, if air is blownonto a region to which the functional liquid is being ejected, adifference in coating thickness near the application line may increase.Accordingly, it is preferable to blow air onto a portion to which thefunctional liquid is ejected, with a time interval of approximately 0.1to 15 seconds after the functional liquid is ejected. It is particularlypreferable to blow air with a time interval of 1 to 5 seconds after thefunctional liquid is ejected. The air-blown region T may be apart fromthe ejection region R, for example, so as to keep this timing.

Furthermore, the application system 1 may further include an air blowingunit for performing an air drying step of drying the entire region towhich the functional liquid is applied, after the application of thefunctional liquid to the glass sheet 10 is ended. As the air blowingunit for performing the air drying step, the application system 1 mayuse the air blowing unit 5, or may use an air blowing unit other thanthe air blowing unit 5. For example, as the air blowing unit other thanthe air blowing unit 5, the application system 1 may use an air blowingunit that can blow air onto the entire glass sheet 10 to perform the airdrying step.

Furthermore, in step S101, the ejection portion 2 of the applicationsystem 1 may apply the functional liquid to the first side 11 using amethod similar to that for applying the functional liquid to the secondside 13 in step S103. In this case, for example, the application system1 controls the robot arm 4 to move the glass sheet 10 closer to thenozzle 22 along the direction in which the nozzle 22 ejects thefunctional liquid. Accordingly, the distance between the nozzle 22 andthe glass sheet 10 becomes shorter, and thus the application system 1can cause the application position where the functional liquid ejectedfrom the nozzle 22 hits to be moved upward. That is to say, theapplication system 1 can cause the position to which the functionalliquid is to be ejected to be moved upward on the first face 15 of theglass sheet 10, without moving the glass sheet 10 downward.

Furthermore, as shown in the example in FIG. 9, the application system 1may include a plurality of ejection portions 2. FIG. 9 shows an examplein which the application system 1 includes a plurality of ejectionportions 2. In this case, for example, the plurality of ejectionportions 2 (two ejection portions 2 in FIG. 9) may be arranged along theupper-lower direction. The application system 1 may cause the positionto which the functional liquid is to be ejected to be moved in theupper-lower direction on the first face 15 using the plurality ofejection portions 2 arranged along the upper-lower direction in thismanner. At this time, the application system 1 can eject the functionalliquid in the upper-lower direction to the first face 15, without movingthe glass sheet 10 to change the position to which the functional liquidis to be ejected, as in steps S101 and S103 above.

Furthermore, the application system 1 may cause the position to whichthe functional liquid is to be ejected to be moved in the upper-lowerdirection on the first face 15 of the glass sheet 10, by changing theforce at which the functional liquid is ejected from the ejectionportion 2. For example, the application system 1 may cause the positionto which the functional liquid is to be ejected downward on the firstface 15, by reducing the force at which the functional liquid is ejectedfrom the ejection portion 2. Furthermore, the application system 1 maycause the position to which the functional liquid is to be ejected to bemoved upward on the first face 15, by increasing the force at which thefunctional liquid is ejected from the ejection portion 2. Also in thiscase, as in the example in FIG. 9, the application system 1 can ejectthe functional liquid in the upper-lower direction to the first face 15,without moving the glass sheet 10 to change the position to which thefunctional liquid is to be ejected, as in steps S101 and S103 above.

Furthermore, the application system 1 may apply the application liquidto the entire first face 15 without providing a certain region in whichthe functional liquid is not to be applied at the upper side 12, or theapplication system 1 may provide a region in which the applicationliquid is not to be applied in addition to the vicinity of the upperedge 12. With this regard, the application system 1 may eject thefunctional liquid not only to the regions near the first side 11, theupper side 12, and the second side 13, but also to other regions on thefirst face 15.

Furthermore, the application system 1 may form a coating on both of thefirst face 15 and the second face 16, or may form a coating on thesecond face 16 without forming a coating on the first face 15. Theapplication system 1 applies the functional liquid to at least one ofthe faces of the glass sheet 10.

Furthermore, the angle at which the robot arm 4 of the applicationsystem 1 holds the glass sheet 10 is not limited to those describedabove, and may be, for example, a vertical angle. With thisconfiguration, the functional liquid is applied to the glass sheet 10 ina state of standing in the vertical direction. Accordingly, thefunctional liquid ejected onto the first face 15 of the glass sheet 10flows downward easily, so that, in the flow-coating method as describedabove, the time necessary to apply the functional liquid can beshortened. Note that, in the foregoing embodiment, the angle of theglass sheet 10 was described based on the portion sucked by the suctioncup 41 of the robot arm 4. However, the angle of the glass sheet 10 maybe described based on other criteria.

Furthermore, when applying the functional liquid along the upper side 12in step S102, the angle D at which the robot arm 4 of the applicationsystem 1 holds the glass sheet 10 may be +10 degrees to −10 degrees.Accordingly, as shown in FIG. 13 described later, a difference incoating thickness near the application line can be suppressed comparedwith that in the foregoing embodiment. Accordingly, distortion of theapplication line can be further suppressed, and the appearance at theapplication line can be improved.

Furthermore, if the application system 1 applies the functional liquidto the entire first face 15, instead of not applying the functionalliquid to a certain region at the upper side 12, the angle D at whichthe robot arm 4 holds the glass sheet 10 may be −30 degrees to −60degrees. Accordingly, the second face 16 is positioned above the firstface 15, and thus a situation can be suppressed in which the functionalliquid ejected onto the first face 15 flows around to the second face16. Accordingly, the appearance of the glass sheet 10 after applicationof the functional liquid can be improved.

Furthermore, in step S102 described above, the application system 1causes the functional liquid ejected onto a partial region of the glasssheet 10 to flow to other regions of the glass sheet 10, therebyapplying the functional liquid to the predetermined region on the firstface 15 of the glass sheet 10. However, instead of applying thefunctional liquid in this manner, the application system 1 may eject thefunctional liquid onto the entire region to which the functional liquidis to be applied, by moving the glass sheet 10 as appropriate.

Furthermore, in the operation that applies the functional liquid, theapplication system 1 may apply the functional liquid to a face of theglass sheet 10 in a state where the upper side of the glass sheet 10 isoriented downward in the vertical direction and the glass sheet 10 isinclined toward the nozzle 22 with respect to the vertical direction(the angle D has a negative value). Note that the state in which theglass sheet 10 is inclined toward the nozzle 22 with respect to thevertical direction refers to a state in which the angle D shown in theexample in FIG. 4 has a negative value. Accordingly, flowing of theejected functional liquid around to the second face 16 can be suppressedduring application of the functional liquid to the first face 15. Notethat, in order to suppress flowing of the functional liquid around tothe second face, for example, the angle D is preferably set to −30 to−70.

FIG. 10 shows an example of a step of applying the functional liquid ina state where the upper side of the glass sheet 10 is oriented downwardin the vertical direction. In the example shown in FIG. 10, step S200 issubstantially the same as step S102. In step S200, the applicationsystem 1 applies the functional liquid so as to form an application lineLa. The application line La is formed so as to extend on the first face15 of the glass sheet 10, along the region to which the functionalliquid was ejected. The functional liquid ejected onto the applicationline La flows downward along the arrows E, and is thus applied to reachthe upper side 12 of the glass sheet 10.

FIG. 11 schematically shows an example of a state of the upper side 12of the glass sheet 10 viewed from the arrow G in FIG. 10. The functionalliquid that has flowed downward to reach the upper side 12 on the firstface 15 of the glass sheet 10, flows around to an end face 121 at theupper side 12. At this time, since the glass sheet 10 is inclined towardthe nozzle 22, the functional liquid flows to a partial region 122 ofthe end face 121 but does not flow to a remaining region 123 of the endface 121. Accordingly, in step S200, the glass sheet 10 is produced onwhich a coating is formed from the application line La to the partialregion 122 of the end face 121 at the upper side 12 of the glass sheet10. If the processing on the glass sheet 10 includes a step in which arobot arm or the like has to hold the end face 121, a portion on whichthe coating is formed becomes slippery. However, since the thusconfigured glass sheet 10 has the region 123 to which the functionalliquid is not applied, the end face 121 can be prevented from beingslippery when it is held by a robot arm or the like during theprocessing.

Others

In order to suppress a difference between the coating thickness on aportion to which the functional liquid is ejected and the coatingthickness on a portion that the functional liquid that has floweddownward reaches, it is sufficient that the application system 1 isconfigured so as to blow air onto a portion to which the functionalliquid as the application liquid is ejected, before the functionalliquid flows downward through that portion. Accordingly, in this case,in the application system 1, the ejection portion 2 may be allowed tomove without being fixed. That is to say, in this case, the applicationsystem 1 may apply the functional liquid to the glass sheet 10, whilethe glass sheet 10 is fixed and moving the ejection portion 2. Also, theapplication system 1 may apply the functional liquid to the glass sheet10, while moving both the ejection portion 2 and the glass sheet 10.

EXAMPLES Regarding Air Flow Orientation

First, in order to study the degree to which a difference in coatingthickness can be suppressed by blowing air onto a portion to which thefunctional liquid was ejected on the glass sheet 10 produced by theapplication system 1 of the foregoing embodiment, Examples 1 to 4 belowwere performed. Note that the present invention is not limited to thefollowing examples.

Example 1

First, as Example 1, an experiment was conducted to study the degree towhich a difference in coating thickness occurs when the functionalliquid is ejected while air is being blown from above in step S102 inFIG. 3. In Example 1, the application system 1 shown in the example inFIG. 2 was used, and an ultraviolet-protection coating liquid having thecomposition shown in Table 1 was used as the functional liquid forapplication on the glass sheet 10. Furthermore, the robot arm 4 held theglass sheet 10 such that the angle formed with respect to the verticaldirection was 0 degrees, and moved the glass sheet 10 held thereby at aspeed of 20 to 40 mm/s. Furthermore, the ejection portion 2 ejected thefunctional liquid from the nozzle 22 to the glass sheet 10 at 2 g (gram)per second. Then, as shown in FIG. 8, air was blown at 0.8 m/s fromabove onto the glass sheet 10.

TABLE 1 Component Mixed Concentrated Ultraviolet Non-siliconeTriethylene solvent hydrochloric absorber surfactant glycol AP-7 Wateracid TEOS GPTMS TINUVIN360 Weight wt % 0.1 0.5 12.8 17.0 0.03 30.0 0.639.0

Note that the mixed solvent AP-7 is a mixed liquid containing 85.5 wt %of ethanol, 8.6 wt % of n-propanol, and 4.8 wt % of i-propanol. GPTMS isγ-glycidoxypropyltrimethoxysilane TEOS is tetraethoxysilane.Furthermore, the “ultraviolet absorber TINUVIN360” is a liquid obtainedby dispersing the ultraviolet absorber TINUVIN at a concentration of 3.6wt % in water.

Examples 2 to 4

Next, as Examples 2 to 4, an experiment was conducted to study thedegree to which a difference in coating thickness occurs when air isblown from the front onto a portion to which the functional liquid wasejected in step S102 in FIG. 3. In Examples 2 to 4, the applicationsystem 1 shown in the example in FIG. 2 was used, and the liquid thatwas the same as that in Example 1 (Table 1) was used as the functionalliquid for application on the glass sheet 10. Furthermore, the robot arm4 moved the glass sheet 10 held thereby at a speed of 45 mm/s, and theejection portion 2 ejected the functional liquid from the nozzle 22 tothe glass sheet 10 at 2 g (gram) per second. Furthermore, the airblowing unit 5 blew air at 2 m/s from the front of the glass sheet 10onto the air-blown region T in the shape of a rectangle having a lengthin the horizontal direction (the left-right direction in FIG. 5B) of1050 mm and a length in the vertical direction (the upper-lowerdirection in FIG. 5B) of 300 mm. In Examples 2 to 4, the degree to whicha difference in coating thickness occurred was studied while causing therobot arm 4 to hold the glass sheet 10 respectively at an angle withrespect to the vertical direction of 0 degrees, 10 degrees, and 45degrees.

The glass sheets 10 respectively used in Examples 2 to 4 have a size of600 mm×600 mm. In Examples 2 to 4, the application system 1 stopped themovement of the glass sheet 10 for 5 seconds after the applicationposition reached the region Rc, and blew air from the air blowing unit 5onto the glass sheet 10. Accordingly, for example, regarding a positionshifted from the first side 11 by 300 mm toward the second side 12, airfrom the air blowing unit 5 was blown onto that position while the glasssheet 10 was moving for the remaining 300 mm and the glass sheet 10 wasstopped for 5 seconds. That is to say, air was blown onto that positionfor approximately 11.7 seconds.

Results

FIG. 12 shows the coating thickness near the application line L when thefunctional liquid was ejected while air was being blown from above(Example 1). FIG. 13 shows the coating thicknesses near the applicationline L when air was blown from the front after the functional liquid wasejected (Examples 2 to 4). FIG. 13 shows the coating thicknesses whenthe glass sheet 10 was inclined at an angle D of 0 degrees (Example 2),10 degrees (Example 3), and 45 degrees (Example 4). On the glass sheet10 shown in the example in FIG. 3, in step S102, the functional liquidejected to form the application line L was caused to flow downward, andthus the functional liquid was applied to the first face 15.Accordingly, the distance from the application line in FIGS. 12 and 13indicates the distance downward from the application line L shown in theexample in FIG. 3. In Examples 1 to 4, the coating thicknesses weremeasured using a laser microscope (VK-9500 manufactured by KeyenceCorporation).

In Examples 1 to 4, undulation of the application liquid generated whenapplying the functional liquid to the glass sheet 10 hardly occurred.However, the thicknesses of the functional liquid coatings formed on theglass sheet 10 were different between the examples as follows.

That is to say, as shown in a region Ma in the example in FIG. 12, whenthe functional liquid was ejected while air was being blown from above(Example 1), the functional liquid was dried in a short time, and adifference in coating thickness of about 2 μm occurred in a regionwithin 1 mm from the application line L, in particular, in a region atand after a point where a local maximum of the coating thicknessappeared first in an area extending downward from the application lineL. On the other hand, as shown in a region Mb in the example in FIG. 13,when air was blown from the front onto the glass sheet 10 inclined at 0degrees or 10 degrees with respect to the vertical direction after thefunctional liquid was ejected (Examples 2 and 3), the difference incoating thickness was about 0.9 μm in a region within 1 mm from theapplication line L, in particular, in a region at and after a pointwhere a local maximum of the coating thickness appeared first in an areaextending downward from the application line L. That is to say, underthe above-described conditions, if air was brown from the front onto theglass sheet 10 after the functional liquid was applied, a difference incoating thickness was suppressed by at least about 1.1 μm. When theglass sheet 10 was inclined at 45 degrees with respect to the verticaldirection (Example 4), the difference in coating thickness was largest.However, even in this case, the difference in coating thickness in aregion within 1 mm from the application line L was about 1.2 μm.

TABLE 2 Difference in coating thickness Appearance 0.9 μm Good 1.2 μmGood 2.0 μm Poor

The appearance of the coating was checked in the portions where such adifference in coating thickness occurred. Table 2 shows appearanceresults. As shown in Table 2, when air was blown from the front onto theglass sheet 10 after the functional liquid was applied, the influence ofthe difference in coating thickness was small, and the appearance of thecoating was good. On the other hand, when the functional liquid wasapplied while air was being blown from above onto the glass sheet 10,the appearance of the coating was poor due to the influence of adifference in coating thickness of about 2.0 μm. That is to say, acomparison between Example 1 and Examples 2 to 4 shows that, if thedifference in coating thickness can be suppressed to about 1.2 μm,distortion generated in the coating can be suppressed, and theappearance of the coating can be improved.

Furthermore, as shown in a region H in the example in FIG. 12, when thefunctional liquid is applied while air is being blown from above ontothe glass sheet 10, a region such as a hill having a relatively largecoating thickness (hereinafter, referred to as a “hill region”) ispartially generated. In Examples 2 to 4, the maximum coating thicknessnear the application line L was 3 μm (when the angle was 45 degrees) asshown in the example in FIG. 13, whereas, in Example 1, the maximumcoating thickness near the application line L was 4.2 μm as shown in theexample in FIG. 12. That is to say, when the functional liquid wasapplied while air was being blown from above onto the glass sheet 10,the coating thickness near the application line L increased.

It seems that this hill region was generated due to the influence ofthis aspect. That is to say, it seems that this hill region wasgenerated due to the fact that the drying of the functional liquidejected to form the application line L was facilitated only at a partialregion of the application line L, and the functional liquid ran downfrom this partial region. On the other hand, as shown in the example inFIG. 13, when air was blown from the front after the functional liquidwas ejected, such a hill region was not generated. In particular, whenair was blown within 60 seconds after the functional liquid was ejected,such a hill region was properly prevented from being generated.Accordingly, it was seen that blowing air after ejecting the functionalliquid is effective for suppressing a difference in coating thickness,but, if air is blown excessively, adverse effects may occur.

These results show that, if air is properly blown after the functionalliquid is ejected, the difference in coating thickness in a regionwithin 1 mm from the application line L can be suppressed, and a hillregion can be prevented from being generated. Accordingly, distortiongenerated in the functional liquid coating can be suppressed, and theappearance near the application line L can be improved.

Under the conditions shown in the example in FIG. 13, glass sheets 10were produced on which the difference in coating thickness in a regionextending downward within 1 mm from the application line L wassuppressed to 1.2 μm or less. In particular, when the angle D of theglass sheet 10 was set to 10 degrees, a glass sheet 10 was produced onwhich the difference in coating thickness in a region extending downwardwithin 1 mm from the application line L was suppressed to 1 μm or less.On such a glass sheet 10, the difference between the coating thicknessnear the application line L is suppressed, and thus distortion due tothe difference in coating thickness is suppressed, and the appearancenear the application line L is good. Accordingly, when changing theseconditions, the conditions may be adjusted so that such a glass sheet 10as described above can be produced. For example, the amount offunctional liquid applied, the angle D of the glass sheet 10, the amountof air blown from the air blowing unit 5, and the like may be adjustedsuch that a glass sheet 10 is produced on which the difference incoating thickness in a region extending downward within 1 mm from theapplication line L is suppressed to 1.2 μm or less.

Other Conditions

Next, the coating thickness was checked while changing variousconditions to produce glass sheets 10 according to Examples 5 to 10below, except for the direction in which air was blown onto the glasssheets 10 after the functional liquid was applied.

Specifically, the glass sheets 10 according to Examples 5 to 10 wereproduced by performing steps S101 to S103 described in the foregoingembodiment using the application system 1 shown in the example in FIG.2. In Examples 5 to 7, the functional liquid that was the same as thatExample 1 (Table 1) was applied. On the other hand, in Examples 8 to 10,an ultraviolet-protection coating liquid having the composition shown inTable 3 below was applied to the glass sheet 10 as the functionalliquid.

TABLE 3 Component Mixed Concentrated Ultraviolet Non-siliconeTriethylene solvent hydrochloric absorber surfactant glycol AP-7 Wateracid TEOS GPTMS TINUVIN360 Weight wt % 0.2 0.5 12.7 17.0 0.03 30.0 0.639.0

In Examples 5 to 10, the robot arm 4 held the glass sheet 10 such thatthe angle formed with respect to the vertical direction was 10 degrees,and moved the glass sheet 10 held thereby at a speed of 60 mm/s.Furthermore, in Examples 5 to 10, the ejection portion 2 ejected thefunctional liquid from the nozzle 22 to the glass sheet 10 at 3.5 g persecond. Then, in Examples 5 to 10, air was blown from the front of theglass sheet 10 onto the portion to which the functional liquid wasejected in step S102 in FIG. 3.

In Example 5, air was blown at a speed of 3 m/s onto a portion to whichthe functional liquid was ejected, after 1.5 seconds after thefunctional liquid was applied. In Example 6, air was blown at a speed of2 m/s onto a portion to which the functional liquid was ejected, 2seconds after the functional liquid was applied. In Example 7, air wasblown at a speed of 3.2 m/s onto a portion to which the functionalliquid was ejected, after 1.5 seconds after the functional liquid wasapplied. In Examples 8 to 10, air was blown at a speed of 2.5 m/s ontoportions to which the functional liquid was ejected, after 2 secondsafter the functional liquid was applied.

Results

FIG. 14 shows the coating thicknesses near the application line L inExamples 5 to 10. As in Examples 1 to 4, in step S102, the functionalliquid ejected to form the application line L was caused to flowdownward, so that the functional liquid was applied to the first face15. Accordingly, the distance from the application line in FIG. 14indicates the distance downward from the application line L shown in theexample in FIG. 3. In Examples 5 to 10, the coating thicknesses weremeasured using a laser microscope (VK-9500 manufactured by KeyenceCorporation).

Also in Examples 5 to 10, undulation of the application liquid generatedwhen applying the functional liquid to the glass sheet 10 hardlyoccurred as in Examples 1 to 4. However, the thicknesses of thefunctional liquid coatings formed on the glass sheet 10 were differentbetween the examples as follows.

That is to say, as shown in the example in FIG. 14, the local maximumthat appeared in the coating thickness first in the direction in whichthe functional liquid flowed from the application line was the largestat 3.2 μm in the case of Example 7. Accordingly, in Examples 5 to 10,glass sheets 10 were produced on which the local maximum that appearedin the coating thickness first in the direction in which the functionalliquid flowed from the application line was suppressed to 3.2 μm orless.

The functional liquid coating is formed, as described above, by causingthe functional liquid to flow downward from the application line.Accordingly, the coating hardly forms on the opposite side of thedirection in which the functional liquid flows, that is, on the sideabove the application line, and the coating appears from a region nearthe application line. Accordingly, if the local maximum that appears inthe coating thickness first in the direction in which the functionalliquid flows downward from the application line is large, a gap betweenan upper region without the coating and a region having this localmaximum increases. Thus, light that is transmitted through the glasssheet is likely to be refracted, and the appearance near the applicationline may be poor. For example, in Example 1, the local maximum thatappeared in the coating thickness first in the direction in which thefunctional liquid flowed from the application line was 4.2 μm, that is,the appearance near the application line was poor.

On the other hand, in Examples 5 to 10 and Examples 2 to 4, the localmaximum that appeared in the coating thickness first in the direction inwhich the functional liquid flowed from the application line wassuppressed to 3.2 μm or less, that is, the appearance near theapplication line was improved compared with that in Example 1. Inparticular, in Examples 2, 3, 5, 6, and 8 to 10, the local maximum wassuppressed to 2.8 μm or less, that is, the appearance near theapplication line was significantly improved compared with that inExample 1.

Furthermore, a comparison between the appearances near the applicationlines in Examples 5 to 10 shows that the appearance at the applicationline was better in Examples 6 and 8 to 10 than in Examples 5 and 7. Thereason for this seems to be as follows. That is to say, in Examples 5and 7, the coating thickness varied relatively frequently in thevicinity of the application line within 1.2 mm therefrom in thedirection in which the functional liquid flowed.

Specifically, in Example 5, the coating thickness had a first localmaximum 2.79 μm at a position that was 0.49 mm from the applicationline. In the range within 0.1 mm downward from the position at the firstlocal maximum, that is, in the range of 0.49 mm to 0.59 mm from theapplication line, the coating thickness varied by 0.59 μm. Furthermore,in the range within 0.1 mm upward from the position at the first localmaximum, that is, in the range of 0.39 mm to 0.49 mm from theapplication line, the coating thickness varied by 0.36 μm. In a similarmanner, in Example 5, the coating thickness had a second local maximum2.46 μm at a position that was 0.69 mm from the application line. In therange within 0.1 mm downward from the position at the second localmaximum, that is, in the range of 0.69 mm to 0.79 mm from theapplication line, the coating thickness varied by 0.55 μm. Furthermore,in the range within 0.1 mm upward from the position at the second localmaximum, that is, in the range of 0.59 mm to 0.69 mm from theapplication line, the coating thickness varied by 0.26 μm.

Furthermore, in Example 7, the coating thickness had a first localmaximum 3.2 μm at a position that was 0.33 mm from the application line.In the range within 0.1 mm downward from the position at the first localmaximum, that is, in the range of 0.33 mm to 0.43 mm from theapplication line, the coating thickness varied by 0.8 μm. Furthermore,in the range within 0.1 mm upward from the position at the first localmaximum, that is, in the range of 0.23 mm to 0.33 mm from theapplication line, the coating thickness varied by 1.0 μm. In a similarmanner, in Example 7, the coating thickness had a second local maximum3.1 μm at a position that was 0.55 mm from the application line. In therange within 0.1 mm downward from the position at the second localmaximum, that is, in the range of 0.55 mm to 0.65 mm from theapplication line, the coating thickness varied by 0.4 μm. Furthermore,in the range within 0.1 mm upward from the position at the second localmaximum, that is, in the range of 0.45 mm to 0.55 mm from theapplication line, the coating thickness varied by 0.8 μm.

That is to say, in Examples 5 and 7, the coating thickness varied bymore than 0.25 μm in both of the ranges within 0.1 mm before and afterthe position at the local maximum of the coating thickness. If thecoating thickness varies by more than 0.25 μm in both of the rangeswithin 0.1 mm before and after the position at the local maximum of thecoating thickness in this manner, the projecting portion indicating thelocal maximum of the coating thickness has a relatively sharp shape.Accordingly, the surface of the coating formed on the face of the glasssheet 10 has a relatively sharp concave-convex shape, and light that istransmitted through the glass sheet 10 is likely to be distorted. InExamples 5 and 7, it seems that this distortion was one cause of theappearance near the application line being poor.

On the other hand, in Examples 6 and 8 to 10, there was no suchvariation in the coating thickness. Specifically, in Examples 6 and 8 to10, in the vicinity of the application line within 1.2 mm therefrom inthe direction in which the functional liquid flowed, the variation inthe coating thickness from a local maximum was suppressed to 0.25 μm orless, the variation being generated in the range having a smallervariation amount in the coating thickness, of the range within 0.1 mmdownward from the position at the local maximum of the coatingthickness, in the direction in which the functional liquid floweddownward, and the range within 0.1 mm upward from the position at thelocal maximum of the coating thickness, in the direction in which thefunctional liquid flowed downward. Accordingly, in Examples 6 and 8 to10, it seems that the coating surface does not have such a sharpconcave-convex shape, and the appearance near the application line wasimproved compared with that in Examples 5 and 7.

Furthermore, in these examples, basically, the local maximum thatappeared in the coating thickness first from the application line wassignificantly different from the second and subsequent local maximums ofthe coating thickness, and the second and subsequent local maximums ofthe coating thickness had similar values. For example, in Example 5, thecoating thickness had a second local maximum 2.46 μm at a position thatwas 0.69 mm from the application line. Furthermore, for example, inExample 7, the coating thickness had a second local maximum 3.1 μm at aposition that was 0.55 mm from the application line.

A study of local minimums adjacent to the local maximum of the coatingthickness shows that, in the coating according to Example 5, the coatingthickness had a local minimum 2.2 μm at a position that was 0.59 mm fromthe application line, and the coating thickness had a local minimum 1.91μm at a position that was 0.79 mm from the application line.Accordingly, in Example 5, the differences between the local maximumthat appeared in the coating thickness second in the downward directionfrom the application line and the local minimums adjacent to the localmaximum were 0.26 μm and 0.55 μm.

In a similar manner, in the coating according to Example 7, the coatingthickness had a local minimum 2.3 μm at a position that was 0.48 mm fromthe application line, and the coating thickness had a local minimum 1.9μm at a position that was 0.89 mm from the application line.Accordingly, in Example 7, the differences between the local maximumthat appeared in the coating thickness second in the downward directionfrom the application line and the local minimums adjacent to the localmaximum were 0.8 μm and 1.2 μm.

In Examples 5 and 7, the differences between the local maximums thatappeared in the coating thickness third and thereafter from theapplication line and the local minimums adjacent to the local maximumswere relatively large. That is to say, in Examples 5 and 7, in thevicinity of the application line within 1.2 mm therefrom in thedirection in which the functional liquid flowed downward, thedifferences between the local maximums that appeared in the coatingthickness second and thereafter from the application line in thedirection in which the functional liquid flowed downward and the localminimums adjacent to the local maximums that appeared in the coatingthickness second and thereafter were relatively large. It seems that,due to this aspect, a sharp concave-convex coating surface was formedover a wide range from the application line in the direction in whichthe functional liquid flowed downward, and the appearance near theapplication line became poor.

On the other hand, in Examples 6 and 8 to 10, there was no suchvariation in the coating thickness, and, in the vicinity of theapplication line within 1.2 mm therefrom in the direction in which thefunctional liquid flowed downward, the differences between the localmaximums that appeared in the coating thickness second and thereafterfrom the application line in the direction in which the functionalliquid flowed downward and the local minimums adjacent to the localmaximums that appeared in the coating thickness second and thereafterwere suppressed to 0.3 μm or less. It seems that, due to this aspect,such a sharp concave-convex coating surface was not formed in Examples 6and 8 to 10, and a coating is formed in which the appearance near theapplication line was better than that in Examples 5 and 7.

Furthermore, in Examples 8 to 10, the variation in the coating thicknessin the region immediately after the application line (e.g., 0 μm to 200μm from the application line) was gentle compared with that in Examples1 to 7. One reason for this seems to be as follows. That is to say, thefunctional liquid used in Examples 8 to 10 contained a larger amount ofsurfactant than that in Examples 1 to 7. Accordingly, compared with thefunctional liquid used in Examples 1 to 7, the functional liquid used inExamples 8 to 10 had a lower surface tension, and was likely to flowdownward on the surface of the glass sheet 10. It seems that, due tothis aspect, a coating was formed in which the variation in the coatingthickness in the region immediately after the application line wasgentle in Examples 8 to 10.

Furthermore, in Examples 5 and 7 in which air was blown at an earlierpoint in time, the local maximum that appeared in the coating thicknessfirst from the application line of the coating formed on the glass sheet10 was larger than that in Examples 6 and 8 to 10. One reason for thisseems to be as follows. That is to say, if the time from when thefunctional liquid is applied to when air is blown is short, thefunctional liquid is highly likely to be dried before the functionalliquid flows sufficiently downward from the application line. It seemsthat, due to this aspect, if air is blown at an earlier point in time,the local maximum that appears in the coating thickness first from theapplication line on the coating formed on the glass sheet 10 becomeslarge.

Furthermore, a comparison between Examples 5 and 7 having differentconditions regarding air speeds shows that, in Example 7 in which thespeed of air blown onto the portion to which the functional liquid wasapplied was high, the local maximum that appeared in the coatingthickness first from the application line on the coating formed on theglass sheet 10 was larger than that in Example 5. One reason for thisseems to be as follows. That is to say, if the intensity (speed) of airblown onto the portion to which the functional liquid was applied isincreased, the functional liquid is dried in a shorter time.Accordingly, the functional liquid is highly likely to be dried beforethe functional liquid flows sufficiently downward from the applicationline. It seems that, due to this aspect, if the intensity (speed) of airblown onto the portion to which the functional liquid was applied isincreased, the local maximum that appears in the coating thickness firstfrom the application line on the coating formed on the glass sheet 10becomes large.

REFERENCE SIGNS LIST

-   -   1 Application system    -   2 Ejection portion    -   21 Base portion    -   22 Nozzle    -   23 Connection portion    -   3 Fixing member    -   31 Catch portion    -   32 First plate member    -   33 Second plate member    -   4 Robot arm    -   41 Suction cup    -   5 Air blowing unit    -   6 Tube member    -   10 Glass sheet    -   11 First side    -   12 Upper side    -   13 Second side    -   14 Lower side    -   15 First face    -   16 Second face

1. A method for producing a glass sheet with a coating, produced byapplying a functional liquid for providing a function to the glasssheet, to at least one face of the glass sheet, comprising: a first stepof supplying the functional liquid to an ejection portion having anozzle that ejects the functional liquid toward the glass sheet; and asecond step of applying the functional liquid to the glass sheet whilemoving the glass sheet relative to the ejection portion in a fixed statesuch that the functional liquid ejected from the nozzle is applied to apredetermined region on the at least one face of the glass sheet;wherein a tube member that transports the functional liquid is connectedto the ejection portion, the tube member is made of a soft material, inthe first step, the functional liquid is supplied by the tube member tothe ejection portion, and and in the second step, the functional liquidis applied to the face of the glass sheet by causing the functionalliquid ejected onto the face of the glass sheet to flow downward. 2.(canceled)
 3. (canceled)
 4. The method for producing a glass sheetaccording to claim 1, further comprising: a third step of, after thefunctional liquid is ejected onto the face of the glass sheet in thesecond step, blowing air onto the portion to which the functional liquidwas ejected.
 5. (canceled)
 6. The method for producing a glass sheetaccording to claim 1, wherein, in the second step, the functional liquidis applied to the face of the glass sheet in a state where an upper sideof the glass sheet is oriented downward in a vertical direction and theglass sheet is inclined toward the nozzle with respect to the verticaldirection.
 7. The method for producing a glass sheet according to claim1, wherein, in the second step, the functional liquid is applied in anupper-lower direction of the glass sheet, by moving the glass sheetcloser to or away from the nozzle in a direction in which the nozzleejects the functional liquid.
 8. The method for producing a glass sheetaccording to claim 1, wherein an application start region from whichapplication of the functional liquid is started is defined on the faceof the glass sheet, and in the second step, after the glass sheet hasmoved to a position where the functional liquid ejected from the nozzlewill hit the application start region, ejection of the functional liquidfrom the nozzle is started.
 9. The method for producing a glass sheetaccording to claim 1, wherein, in the second step, an application linealong a region onto which the functional liquid was ejected is formed onthe face of the glass sheet, and the application line is formed along atleast part of a peripheral edge of the glass sheet.
 10. (canceled) 11.(canceled)
 12. (canceled)
 13. (canceled)
 14. A glass sheet, comprising:an application line formed in a step in which a functional liquid forproviding a function to the glass sheet is applied to a face of theglass sheet, the application line being on the face of the glass sheetalong a region to which the functional liquid was ejected; and a coatingformed by causing the functional liquid ejected onto the applicationline to flow downward, wherein the coating in a vicinity of theapplication line within 1.2 mm therefrom in a direction in which thefunctional liquid flows downward is such that a variation in a coatingthickness from a local maximum is suppressed to 0.25 μm or less, thevariation being generated in a range having a smaller variation amountin the coating thickness, of a range within 0.1 mm downward from aposition at the local maximum of the coating thickness, in the directionin which the functional liquid flows downward, and a range within 0.1 mmupward from the position at the local maximum of the coating thickness,in the direction in which the functional liquid flows downward.
 15. Aglass sheet, comprising: an application line formed in a step in which afunctional liquid for providing a function to the glass sheet is appliedto a face of the glass sheet, the application line being on the face ofthe glass sheet along a region to which the functional liquid wasejected; and a coating formed by causing the functional liquid ejectedonto the application line to flow downward, wherein the coating in avicinity of the application line within 1.2 mm therefrom in a directionin which the functional liquid flows downward is such that differencesbetween local maximums that appear in a coating thickness second andthereafter from the application line in the direction in which thefunctional liquid flows downward, and local minimums adjacent to thelocal maximums that appear in the coating thickness second andthereafter are 0.3 μm or less, except for a local maximum that appearsin the coating thickness first from the application line in thedirection in which the functional liquid flows downward.
 16. (canceled)